 windshield install rubber thickness? |
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| TonyA |
 Sep 15 2025, 02:38 PM
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#1
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Nachmal  Group: Members Posts: 620 Joined: 17-November 16 From: Hilltown PA Member No.: 20,596 Region Association: North East States 
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When installing the windshield Ian Kars' video states 5/16" and AA states 1/4"
Which is correct? Or what have you guys used? |
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| dr914@autoatlanta.com |
Sep 15 2025, 03:07 PM
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#2
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914 Guru Group: Members Posts: 8,208 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
nope 5/16ths
years ago with the some of the ill fitting windshields we had to go down in the width of the buytl, hence the 1/4. However with today's windshields 5/16 will do it QUOTE(TonyA @ Sep 15 2025, 01:38 PM)  When installing the windshield Ian Kars' video states 5/16" and AA states 1/4" Which is correct? Or what have you guys used? |
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| IronHillRestorations |
Sep 15 2025, 03:59 PM
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#3
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I. I. R. C. Group: Members Posts: 6,865 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None
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As usual, George is spot on. The newer budget windshields are thinner so definitely the 5/16” works better.
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| iankarr |
Sep 15 2025, 10:26 PM
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#4
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The wrencher formerly known as Cuddy_K Group: Members Posts: 2,571 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region
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The trick is that the butyl needs to be thick enough to contact the glass all the way around, but not so thick that the glass sits too proud of the frame for the windshield trim to fit.
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| bdstone914 |
Sep 16 2025, 05:14 AM
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#5
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bdstone914 Group: Members Posts: 5,122 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
The butyl rolls can vary in diameter. We had an installer come out and found what was marked as 5/16 was closer to 1/4.
Also be careful as you install the bully to not stretch it. Years ago I was the night manager at a factory that made the butyl rools. They were made with an extruder feeding onto a vacuum bekt. The size was controlled by the belt and extruder speed. Had to constantly monitor the size. |
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| TonyA |
Sep 18 2025, 09:21 AM
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#6
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Nachmal Group: Members Posts: 620 Joined: 17-November 16 From: Hilltown PA Member No.: 20,596 Region Association: North East States
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Thanks guys!
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